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随着对酸性土壤开发利用的重视和酸沉降等所带来的土壤及环境酸化问题的突出,土壤中铝形态及转化的研究受到国内外学者的关注.游离态铁、铝氧化物是土壤中最重要的两类氧化物,对它们的形态、转化与功能的研究,成为土壤学微观领域研究的前沿和热点.对游离氧化铁的研究起步较早,其形态区分方法也较完善.将酸性草酸铵提取的铁称为非晶形铁(Feo)、连二亚硫酸钠-柠檬酸钠-碳酸氢钠(DCB)溶液提取的铁称为游离铁(Fed),Fed与Feo之差(Fed—Feo)称为晶形铁,已为土壤学界广泛接受.但对游离态的氧(氢氧)化铝,由于
With the emphasis on the development and utilization of acid soils and acid precipitation brought by acid and soil salinization problems highlighted, the study of the form and transformation of aluminum in soil by domestic and foreign scholars attention.Free iron, aluminum oxide is the most Two important types of oxides, their morphological, transformation and function of the research into the forefront of soil science and research hot spots.Studies on the free iron oxide started earlier, its morphological distinction method is also more perfect.The acidic oxalic acid Iron extracted from ammonium is called Feo, and iron extracted from sodium bisulfite-sodium citrate-sodium bicarbonate (DCB) solution is called free iron. The difference between Fed and Feo (Fed-Feo) For the crystalline iron, has been widely accepted by the soil science, but for free oxygen (aluminum hydroxide), due to